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    <p>Just to <strong>add on to NathanAW's great solution</strong> above, I thought I'd <strong>point out some context</strong>, such as <i><b> where </b></i> to place the C# code in this case. I'm still pretty new to WPF so I struggled at first to figure out where to put NathanAW's code. When I tried putting that code in the constructor for the UserControl that hosted my Popup, <code>Window.GetWindow()</code> always returned <code>Null</code> (so the "bump" code never executed). So I thought that other newbies might benefit from seeing things in context. </p> <p>Before showing the C# in context, here's some example XAML context to show some relevant elements and their names:</p> <pre><code>&lt;UserControl x:Class="MyNamespace.View1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" &gt; &lt;TextBlock x:Name="popupTarget" /&gt; &lt;Popup x:Name="myPopup" Placement="Bottom" PlacementTarget="{Binding ElementName=popupTarget}" &gt; (popup content here) &lt;/Popup&gt; &lt;/UserControl&gt; </code></pre> <p>Then in the code-behind, to avoid having <code>Window.GetWindow()</code> return <code>Null</code>, wire up a handler to the Loaded event to house NathanAW's code (see <a href="https://stackoverflow.com/a/304604/718325">Peter Walke's comment</a> on a similar stackoverflow discussion for example). Here's exactly how it all looked in my UserControl code-behind:</p> <pre><code>public partial class View1 : UserControl { // Constructor public View1() { InitializeComponent(); // Window.GetWindow() will return Null if you try to call it here! // Wire up the Loaded handler instead this.Loaded += new RoutedEventHandler(View1_Loaded); } /// Provides a way to "dock" the Popup control to the Window /// so that the popup "sticks" to the window while the window is dragged around. void View1_Loaded(object sender, RoutedEventArgs e) { Window w = Window.GetWindow(popupTarget); // w should not be Null now! if (null != w) { w.LocationChanged += delegate(object sender2, EventArgs args) { var offset = myPopup.HorizontalOffset; // "bump" the offset to cause the popup to reposition itself // on its own myPopup.HorizontalOffset = offset + 1; myPopup.HorizontalOffset = offset; }; // Also handle the window being resized (so the popup's position stays // relative to its target element if the target element moves upon // window resize) w.SizeChanged += delegate(object sender3, SizeChangedEventArgs e2) { var offset = myPopup.HorizontalOffset; myPopup.HorizontalOffset = offset + 1; myPopup.HorizontalOffset = offset; }; } } } </code></pre>
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    1. POHow can I move a WPF Popup when its anchor element moves?
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    1. USJason Frank
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    1. COExcellent follow up.. I was getting the Window null issue too!
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      1. USCraig
    2. CO+1 for SizeChanged.
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      1. USMatt Davis
 

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